* Money-market funds saw $127.4 bln inflow in Dec

* Stock, mixed-equity funds post $27.3 bln outflow in Dec

* Funds post $503.2 bln inflow in 2008, due to money funds

BOSTON, Jan 16 (Reuters) - Investors poured a net $127.4 billion into U.S. money-market mutual funds in December, taking shelter in the relatively safe instruments on concerns about volatile stock and bond markets, data from research firm Lipper Inc showed.

Money-market funds, which had $121.6 billion of inflows in November, attracted a net $658.2 billion for the whole of 2008, Lipper said.

Stock and mixed-equity funds saw outflows of $27.3 billion in December, more than the outflows of $26.4 billion in the previous month, the research firm said. Stock funds saw net outflows of $176.7 billion for the whole of 2008, it said.

Bond funds narrowed their outflows in December to $6.7 billion from $16.7 billion in the previous month, Lipper said.

Overall, U.S. mutual funds saw net inflows of $503.2 billion in 2008, the research firm said. The numbers do not include flows of exchange-traded funds (ETFs).

Lipper is a unit of Thomson Reuters (TRI.TO: Quote, Profile, Research) (TRIL.L: Quote, Profile, Research). (Reporting by Muralikumar Anantharaman; Editing by Andre Grenon)